DO NOT MERGE: fix for the XPath nodeTab use-after-free bug from nmehta@

see https://bugs.chromium.org/p/chromium/issues/detail?id=705445

Bug: 36809819
Change-Id: I4832550032669a8e921bd46068281d9daf594ae1
(cherry picked from commit 7f671748797331e20da23db2d95a6116bb1c6c55)

xpath.c

diff --git a/xpath.c b/xpath.c
index 67afbca..3472ff0 100644
--- a/xpath.c
+++ b/xpath.c
@@ -4368,7 +4368,7 @@
     }
     memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
     ret->type = XPATH_XSLT_TREE;
-    ret->boolval = 1;
+    ret->boolval = 0;
     ret->user = (void *) val;
     ret->nodesetval = xmlXPathNodeSetCreate(val);
 #ifdef XP_DEBUG_OBJ_USAGE